Affiliation: | (1) Center for LifeLong Learning & Design (L3D), University of Colorado, Boulder, USA;(2) Information Systems and New Media, University of Siegen, Siegen, Germany;(3) International Institute for Socio-Informatics, Dorotheenstr. 76, 53111 Bonn, Germany;(4) Fraunhofer Institute for Applied Information Systems (FhG-FIT), Sankt Augustin, Germany |